Irrational thoughts

So I spoke to my ex for a few days this week, it was the first we've spoken since our break up a few weeks. We talked about how we felt to a certain degree(nothing about getting back together), and it's put me more at ease as some of my worries have been lifted. But sometimes I just have this weird feeling where I think 'What if everything she said was a complete lie?' and I wonder if she's just laughing at me - after all, I can't see her through texts. Of course I am most likely being irrational. She has done some nasty things but nothing to make me thing she's that devious, and I do trust her. I never really let these thoughts get to me because they're pretty ridiculous, but a couple of times I've wondered if there is the slightest bit of truth to this. So my questions are: Is this normal? Do a lot of people think of random scenarios that might happen - no matter how unlikely or irrational? Or is it just me? If so, does that mean anything more than that? Or is it just me being silly?

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